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In a cognitive network where both primary and secondary systems are Orthogonal Frequency Division Multiplexing modulated, carrier frequency offset between the two systems is inevitable and may cause harmful interference. In this paper, we jointly optimize the transceiver for the secondary system considering the frequency offset between secondary transmitter (ST) and primary receiver (PR). We first...
Space-time focusing transmission in impulse-radio ultra-wideband (IR-UWB) systems resorts to the large number of resolvable paths to reduce the inter-pulse interference as well as the multiuser interference, and to simplify the receiver design. In this paper, we study the spatial user capacity of IR-UWB systems with space-time focusing transmission where the users are randomly distributed. We will...
In this paper, we address the problem of user scheduling in downlink coordinated multi-point transmission (CoMP) systems, where multiple users are selected and then served with zero forcing beamformer simultaneously by several cooperative base stations (BSs). To reduce the enormous overhead led by obtaining full channel state information at the transmitter, a low-feedback user scheduling method called...
Ultra-wideband (UWB) signal has fine time resolution and can resolve a large amount of multipath in densely scattered environments. Exploiting these features, UWB systems can accomplish space-time focusing transmission. At the focused spot there will exhibit an energy peak, while in other places very weak interference will be induced. The space-time focusing transmission can not only enable the use...
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